As the data set grows larger and the number of attributes grows larger, we can create trees that become increasingly complex.
随着数据集的增大以及属性数量的增长，我们所创建的树就会越来越复杂。
An XML schema can define the structure, the element and attributes, their data types, value ranges, etc. that are allowed in a set of XML documents.
XML模式可以定义一组XML文档所允许的结构、元素和属性、它们的数据类型、取值范围等。
It also can be used to reduce the number of dimensions in a data set in order to focus on only the most useful attributes, or to detect trends.
它还可以用于减少数据集中的维度数据，以便只专注于最有用的属性，或者用于探明趋势。
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